AlCoNi十次准晶与金属铜间扩散机制分析

摘  要：本文利用扫描电镜和透射电镜分析了粉末冶金法制备的Al₇₂Co₂₀Ni₈十次准晶颗粒与Cu基体之间的扩散行为与反应机制。研究发现700℃下，Cu原子沿两个方向扩散进入准晶颗粒，一是沿着准晶晶粒的晶界，二是垂直于准晶周期轴方向扩散进入其晶粒内部。Al₇₂Co₂₀Ni₈准晶由于Al原子向外扩散先转变为片层状Al（Co,Ni）_x过渡晶体相，最终生成为Al-Co相。Al₇₂Co₂₀Ni₈准晶颗粒中的Al原子过饱和固溶到基体Cu之中，冷却后析出Cu-Al相。

关键词：十次准晶；Al-Co-Ni；扩散

中图分类号：O753⁺.3；TG115.21⁺5.3   文献标识码：A

Abstract:Diffusion behavior between Al₇₂Co₂₀Ni₈quasicrystalline particles and Cu was investigated by powder metallurgy. Experimental results showed that Cu atoms diffuse along two directions within quasi-crystal particles.After different heat treatment, Al₇₂Co₂₀Ni₈ decagonal quasicrystal transformedinto lamellae of the Al(Co,Ni)_x transitional crystal phase, and then decomposed into Al-Co phase.

Keywords:decagonal quasicrystal; Al-Co-Ni; diffuse;

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